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机构:
Southern Med Univ, Nanfang Hosp, Dept Obstet & Gynecol, 1838 Guangzhou Ave, Guangzhou 510515, Peoples R China
Peking Union Med Coll, Peking Union Med Coll Hosp, Dept Obstet & Gynecol, Beijing 100730, Peoples R China Airforce Med Univ, Xijing Hosp, Dept Obstet & Gynecol, Xian 710032, Peoples R China